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EFF joined the American Civil Liberties Union (ACLU) Foundation and the ACLU Foundation of Texas in backing a judge who required a search warrant before approving the seizure of two months of cell phone location data by law enforcement. In this case, the government asked a magistrate judge to ap

EFF fought the government's attempts to track the location of a mobile phone user without sufficient evidence.

The government had argued that it did not need to show probably cause that a crime was being committed. Consistent with EFF's brief, a federal magistrate judge in New York rejected the government's arguments, calling them "unsupported," "misleading," "contrived," and a "Hail Mary." Since there, several judges have made similar rulings.